Kaspersky Total Security version 21.3.10.391 for Windows is an all-in-one protection suite designed to provide comprehensive defense against malware, ransomware, and online privacy threats. As of 2026, while this version remains functional on many systems, Kaspersky has transitioned its core consumer offerings to a new tiered structure (Standard, Plus, and Premium) with updated interfaces. Core Security Capabilities
This version includes the high-performing malware engine consistently recognized by independent labs.
Real-Time Antivirus: Continuously scans for viruses, Trojans, rootkits, and spyware.
Automatic Exploit Prevention: Specifically for Windows, this feature identifies network exploits like EternalBlue that can crash operating systems.
Anti-Ransomware: Monitors for behavior typical of ransomware to block attacks before files are locked.
Two-Way Firewall: Manages both incoming and outgoing network requests to prevent unauthorized access. Privacy and Premium Features
The "Total Security" tier distinguishes itself from standard antivirus by including advanced privacy and family tools: Kaspersky Total Security 2022 updates
Kaspersky Total Security 2021 (v21.3.10.391): Is It Still Worth It?
Kaspersky Total Security 2021 (version 21.3.10.391) remains a functional, multi-layered defense suite for Windows users, though it has recently been succeeded by a new subscription lineup. This specific build, released as part of the "MR3" update cycle, was designed to provide comprehensive protection ranging from traditional antivirus to advanced privacy tools like file encryption and parental controls. Key Features of Version 21.3.10.391
This version introduced several critical performance and usability enhancements tailored for Windows 10 and early Windows 11 environments:
Enhanced Web-Antivirus: Improved notification clarity when navigating to phishing sites and better integration with the Kaspersky Protection browser extension.
Windows Compatibility: Specifically added official support for Windows 10 version 21H1 and addressed vulnerabilities related to report file management.
Privacy & Data Protection: Includes military-grade folder encryption, a secure password manager, and Safe Money for protecting online financial transactions.
Parental Controls: Features the full version of Kaspersky Safe Kids, offering screen time management and GPS tracking. System Requirements for Windows
To run version 21.3.10.391 smoothly, your PC should meet these minimum specifications: Operating System: Windows 7 (SP1+), 8.1, 10, or 11. Processor: 1 GHz or faster (SSE2 support required). RAM: 1 GB for 32-bit systems or 2 GB for 64-bit systems. Disk Space: At least 1.5 GB of free space. Important: The Transition to New Plans
While version 21.3.10.391 is still supported, Kaspersky has officially stopped selling "Total Security" in many regions. It has been replaced by three new subscription tiers: Kaspersky Standard: Basic antivirus and performance tools.
Kaspersky Plus: The closest direct successor to Total Security, adding an unlimited VPN and Data Leak Checker.
Kaspersky Premium: Includes identity protection and 24/7 priority expert support. Kaspersky renewal or subscription
This paper provides an overview of Kaspersky Total Security 2021 (Version 21.3.10.391), focusing on its features, system requirements, and the specific improvements introduced in this release for Windows users. Overview: Kaspersky Total Security 2021 (21.3.10.391)
Kaspersky Total Security 2021 is a high-tier security suite designed to provide comprehensive protection against a wide range of digital threats. Version 21.3.10.391 (also known as MR3) is a stable release that focuses on enhancing web security, streamlining technical support, and improving the overall user interface. 1. Key Features and Capabilities Kaspersky Total Security 2021 21.3.10.391 for W...
Multi-Layered Protection: Combines traditional signature-based detection with advanced behavioral heuristics to block both known malware and zero-day threats.
Web-Antivirus Enhancements: In version 21.3.10.391, notification texts for phishing and potentially dangerous sites were improved. If HTTPS traffic scanning is disabled, protection is maintained via the Kaspersky Protection browser extension. Privacy & Identity Tools:
Safe Money: A hardened browser for secure online banking and shopping.
VPN Secure Connection: Encrypts data and masks IP addresses (limited daily data unless upgraded).
Password Manager: Stores and syncs credentials securely across devices.
Webcam Protection: Prevents unauthorized access to the device's camera.
Family Safety: Includes a full version of Kaspersky Safe Kids, offering parental controls such as screen time limits, social media monitoring, and GPS tracking.
Performance Optimization: Features a Gaming Mode that pauses notifications and heavy scans to ensure maximum system performance during play. 2. Technical Specifications & Requirements
Version 21.3.10.391 is optimized for performance on modern Windows environments but remains compatible with older systems. Minimum Requirement Operating System Windows 7 (SP0 or later), 8, 8.1, 10, and 11 CPU 1 GHz or higher (SSE2 instruction set support required) RAM 1 GB (for 32-bit OS) or 2 GB (for 64-bit OS) Free Disk Space 1500 MB (1.5 GB) Other
Internet connection for activation and updates; .NET Framework 4.0+ 3. Notable Improvements in Version 21.3.10.391
The MR3 (Maintenance Release 3) update brought specific functional refinements: Kaspersky Total Security 20 System Requirements
Unlike the standalone version, KTS 21.3 bundled the Kaspersky Password Manager (KPM) v9. This allowed unlimited password storage on a single device for free, with sync requiring a premium upgrade.
If you are installing version 21.3.10.391 on an old machine, these are the requirements:
| Component | Minimum Spec | | :--- | :--- | | OS | Windows 7 SP1 (with ESU support), Windows 8.1, Windows 10 (20H2) | | RAM | 1 GB (32-bit) / 2 GB (64-bit) | | Disk Space | 1.5 GB free | | Processor | 1 GHz | | Screen | 1024 x 768 (for the GUI to render properly) |
Warning for modern users: This version will install on Windows 11, but due to Microsoft's security changes (Virtualization-Based Security, Hypervisor-protected Code Integrity), you may experience performance glitches or a warning that the software is "Not fully compatible."
✔ Top-tier malware detection & removal
✔ Lightweight on modern hardware
✔ Feature-rich without excessive bloat
✔ Excellent ransomware rollback (System Watcher)
✔ Quiet mode for gamers & presenters
The interface is clean, organized into four main tabs:
The dark theme option is present. Menus are responsive, though navigating advanced settings (e.g., exclusions, scan schedules) requires digging into “Settings” – typical for power users. The notification system can be tuned down to avoid alert fatigue.
Build 21.3.10.391 of Kaspersky Total Security 2021 represents a polished, feature‑rich consumer security suite suitable for families and users who want a consolidated protection dashboard. Its strengths are broad functionality and strong detection; its tradeoffs are complexity and higher system/resource impact. Keep the product and Windows up to date, monitor vendor patch notes for compatibility fixes, and contact support if staged patch distribution or update failures occur. Kaspersky Total Security version 21
(Date: March 23, 2026)
Kaspersky Total Security 2021 (Version 21.3.10.391) for Windows
Kaspersky Total Security 2021 remains a comprehensive security suite designed to protect Windows PCs against a wide array of digital threats. Version 21.3.10.391
(Maintenance Release 3) is a significant update in this product line, introducing critical compatibility and functional improvements. Key Features and Improvements in Version 21.3.10.391
Released in early 2021, this specific version focused on stability and modern OS support: Windows 10 Version 21H1 Support : Full compatibility with the May 2021 Windows update. Enhanced Web Anti-Virus
: Improved notification text for phishing sites and refined protection for HTTPS traffic via the Kaspersky Protection extension Technical Support Integration
: Direct links to technical support chats were added within the interface. Vulnerability Patches
: Fixed specific security risks, such as a vulnerability related to Mozilla Firefox file creation. Interface Refinements
: Includes an updated installer icon and a streamlined "My Kaspersky" portal experience. Core Protection Capabilities
As a "Total Security" product, it offers more than basic antivirus features: Privacy & Identity
: Includes a password manager and an identity vault for securing documents. Unlimited VPN
: Provides bank-grade encryption for web traffic (availability may depend on license type).
: Advanced parental controls, including GPS tracking for child devices. Financial Protection
: "Safe Money" technology secures online banking and shopping transactions. System Requirements
To run version 21.3.10.391 smoothly, your system should meet these minimum specifications Disk Space : 1500 MB of free hard drive space.
: Must support the SSE2 instruction set (1.66 GHz or faster for tablets). : At least 1000 MB (1 GB) of free RAM. OS Support
: Windows 7 (SP1+), Windows 8, 8.1, and Windows 10. Note that Windows 11 may require additional patches for optimal stability. Current Status and Upgrading
As of late 2024, Kaspersky has largely transitioned from the "Total Security" branding to a new simplified tier system: Standard, Plus, and Premium Kaspersky Support Forum New Kaspersky Total Security Software Solutions
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It seems you're looking for a guide or information regarding Kaspersky Total Security version 21.3.10.391. This specific version was a major release for the 2021 product line.
Since then, Kaspersky has transitioned its product lineup from "Total Security" to a new tiered subscription model (Standard, Plus, and Premium). However, if you are still using or installing version 21.3.10.391, here is a quick guide to its essential functions: 1. Installation & Version Check
Installation: You can typically download the installer from the Kaspersky Support Portal. If you have an existing license, it will automatically activate the features.
Verification: To confirm you are on version 21.3.10.391, hover your mouse over the Kaspersky icon in the Windows system tray. A pop-up will display the full version number. 2. Core Protection Features
Kaspersky Total Security is an "enhanced" version of their Internet Security suite. Key features included in this build are:
Safe Money: Automatically opens a protected browser when you visit banking or shopping sites.
Privacy Protection: Blocks unauthorized access to your webcam and prevents websites from tracking your browsing habits.
Password Manager: A built-in tool to store and sync passwords across devices.
File Encryption & Shredder: Allows you to create "vaults" for sensitive files and permanently delete data so it cannot be recovered. 3. Managing the Software
Running a Scan: Open the main dashboard and select Scan. It is recommended to run a "Full Scan" immediately after installation to ensure your system is clean.
Disabling Protection: If you need to install a trusted program that the antivirus is blocking, right-click the icon in the system tray and select Pause protection. You can choose to pause for a specific duration or until you manually restart it. 4. Safety and Reliability
Kaspersky products consistently receive top marks from independent labs like AV-TEST and AV-Comparatives, often showing protection rates near 99.9%.
Note for US Users: Please be aware that the US Department of Commerce has recently issued restrictions on the sale and distribution of Kaspersky software in the United States. If you are located in the US, you may find that updates are no longer available or the software has been transitioned to a different provider (like UltraAV).
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The build used a multi-layered approach: